Metallic rope



April 12, 1938. H. w. RIDDLE METALLIC ROPE Filed June' 26, 1936 I hweizfoir HQEVE'Y W. E/DDLE,

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Patented Apr. l2, l93

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flllidlillil) Application June 26, 1936, Serial No. $7,560

((311. lift-=59) 3 iillaims.

This invention relates to metallic rope, and more particularly those which are partially fiattened throughout their lengths, thus presenting more surface to external wear.

According to current practice, main rope strands for use in the foregoing manner are usually formed while employing acore of a shape similar to that desired in the finished rope strand. This core is covered with one or more layers of to covering wire, and the finished rope strand de rives its shape from that of the core.

it is among the objects of the present invention to provide a novel triangular core which may be subsequently provided with one or more 315 layers of covering wires and form a metallic rope possessing unusual characteristics. That is to say, the core of the present invention presents a well defined triangular cross-section which is retained under great compressive force. in ad-- dition, it presents a smooth exterior surface which makes very frequent contact with the layer of covering wires and thus afiords the latter good support in all sections. Furthermore, it presents a larger exterior surface to abrasive wear which is caused by the slight movement of the covering wires as the main rope is flexed; and is capable of taking its proportional share of the load imposed on the main rope.

The foregoing and further objects will be ap- 3@ parent after referring to the drawing, in which:

Figure l is a side elevation of the stded article of the invention.

Figures 2 through 7 are end elevations taken at diflerent positions along the length of the assembly of Figure l to illustrate the manner of its fabrication.

Referring more particularly to the drawing, the numeral 2 designates the center element which may be in the form of a round fiber cord, round metal wire, or a unit composed of several twisted wires. This center 2 is covered by several strands d, t, t, t, l, and t, which are spirally twisted around it. Each of the strands t, t, t, t, l and a is composed of two round metal wires which were previously twisted together.

The length of the lay, or twist, of the strands t, t, 5, t, l and 8 is such that the length of that strand containing three half-twists will reach approximately once around the assembly as said strand is disposed in the finished assembly.

When constructed and arranged in accordance with the teaching of the invention, the strands are laid in the assembly in the proper respective relation to each other, and a continuous trian angular cross-section is established. 'l'he three flattened surfaces, or sides, of the triangle are formed by those parts of the strands of the assembly which lie with both wires thereof in contact with the center 2, as shown at it in Figures 3, 5 and 7. The three points or peaks of the tri- 5 angle are formed by those parts of the strands of the assembly at which one wire crosses over the other whereinonly one wire contacts the center 2, as shown at d in Figures 2, 4 and 6.

'li'he covering wires (not shown) which cover to the strands t, t, e, t, l and it may be laid in a suitable manner.

If desired, the smoothness of the outside surface of the assembly may be further increased (e. g., to provide better support for the coverin wires which are to be placed over the strands it, it, t, t, l and d) by increasing the number of strands. lihls pelts an approximate proportional decrease in the size of the wires of the strands. That is, the smaller wires, being more 20 compactly placed, contact the covering wires more frequently, and thus afiord them better support.

While it have sho and described one specific embodiment of my invention, it will be understood that I do not msh to be limited exactly thereto, since various modifications may be made without departing from the scope of my haven-=- tion, as defined by the following claims.

I claim: m

1 As a new article of manufacture, a metallic rope core having at least one partially flattened surface, said rope core being composed of a center and a plurality of strands laid spirally thereon, each of said strands being composed of a pair 35 of twisted wires, the twist of each strand being such that one revolution thereof around the assembly will contain three half-twists.

2. a wire rope having three partially flattened surfaces, said rope being composed of a center we strand and a plurality of strands laid spira y thereon, each of said strands composed of a pair of twisted wires, the twist of each strand being such that one revolution thereof around the assembly will contain three half twists.

3. As a new article of manufacture, a metallic rope having at least one partially nattenedsurface, said rope being composed of a center strand and a plurality of strands laid spirally thereon, each of said strands composed of a pair of twisted 50 wires, the twist of each strand being such that one revolution thereof around. the assembly contain three half twists. 

